Thumbscrew



Aug. 28, 1945. MOSS!- ma ma THUMB SCREW Filed' J 1' 1942 TTORE Patented Aug. 28, 1945 UNITED STATES rem" OFFICE THUMBSCREW Chester C. Moss, Jackson, Mich., assignor to Walker Manufacturing Company of Wisconsin, Racine, Wis., a corporation of Wisconsin 2 Claims.

The present invention relates to thumb screws and in particular is directed to a new and improved fabricated thumb screw.

The principal objects of the present invention are to provide a simple, efficient thumb screw, of new and improved construction, which is peculiarly adapted for simple, economical and efiicient production.

Having in view the above and other objects, which appear from the following description and claims, a preferred, but illustrative embodiment of the invention is shown in the accompanying drawing, throughout the several views of which corresponding reference characters are used to designate corresponding parts, and in which:

Figure 1 is a view in perspective, looking down on the complete embodiment of the invention;

Fig. 2 is a view in perspective, looking up at the same embodiment;

Fig. 3 is a view in perspective, showing the parts of the thumb screw prior to fabrication; and

Fig. 4 is a view taken along the line 4-4 of Fig. 1.

The illustrated thumb screw comprises generally a screw member l0, having a threaded shank l2, adjacent one end and a head It at the other end; and a cap member l6, which fits over the head M and is non-rotatively secured thereto.

The head 14 is provided with two diametrically opposed arms l8, perpendicularly disposed with respect to the axis of the shank l2, and of generally rectangular cross-section.

The cap I6 is drawn from sheet metal to a form resembling that of an inverted trough and is adapted to freely but snugly receive the head M with its arms l8, as is clearly shown in Fig, 3.

' At the central portion 2!] of the cap Hi, the trough is enlarged to receive the head M of the screw member ID. The end portions 22 of the cap l6 are so proportioned that the arms I 8 are received therein and that the trough of said en ortions 22 is substantially deeper than the corresponding thickness of the arm l8 such that the portions 24 of the sidewall ofthe trough extend beyond the received arms l8 and may be folded over said arm l8, as shown in Fig. 2 and in cross-section in Fig. 4.

The assembly of the cap l6 and the screw member Ill into the completed thumb screw is accom-- plished by inserting the headed end 14 of the screw member ID into the trough of the troughshaped cap I6, the head M being received in the central portion of the cap and arms H3 in the end portions 22 of the cap. The portions 24 of the sidewalls of the troughs are then folded over the arms 18 and thereby brought into firm engagement therewith.

When the screw member ID and cap l6 are thus assembled and the portions 24 folded tightly over the arms IS in the manner described, the parts of the assembled thumb screw are securely held against rotary movement with respect to each other by the engagement of the arm 18 and the 7 Walls of the end portions 22, within which the arms I8 are received. The assembled relation is maintained and removal of either of the members of the thumb screw from its position with respect to the other is prevented by the engagement of the wall portions 24 and the arms l8.

The end portions 22 of the cap it extend considerably beyond the ends of the arms I8 when the members are in the assembled position and thereby furnish greater leverage for turning the thumb screw and facilitate manual operation thereof.

What I claim is:

1. A thumb screw comprising a T-shaped stud having a head section and a threaded section, said head section having radially-extending, diametrically-opposed arms which are formed to provide gripping edges, and a cap-piece which is generally channel-shaped in cross-section and which fits over, and seats on, said head section and said radially-extending arms, said cap-piece having a body portion which conformably engages substantial areas of opposite sides of said head section and wing extensions which fit over said radially-extending arms to provide a driving connection between said cap-piece'and stud, said wing extensions overlying said edges and having portions which are deformed to engage under said edges, whereby to secure the cap-piece on said head section.

2. A thumb screw comprising a T-shaped-stud having a head section and a threaded section, said head section being formed with radiallyextending, diametrically-opposed arm's which are relatively short, substantially rectangular in cross-section and of a width less than the diameter of said head section, and a cap-piece which is generally channel-shaped in cross-section and which fits over, and seats on, said head section and said radially-extending arms, said cap-piece having an enlarged body portion which conformably engages substantial areas of opposite sides of said head section and wing extensions which are of substantially greater length than said radially extending arms, the wing extensions fitting over said radially-extending arms to provide a driving connection between said cap-piece and (stud, said wing extensions overlying the opposite sides of, and having marginal edges which are deformed to engage under, said radially-extending arms whereby to secure the cap-piec on said head section.

CHESTER C. MOSS. 

